bicycle=['trek','cannondale','readline','specialized']
print(bicycle[0])
print(bicycle[1].upper())
print(bicycle[2].title())
print(bicycle[-1])
friends=['wyk','cs','zk','c']
print(f"{friends[0]}nihao")
xiaideshiwu=['computer','books','movies','music']
print(f"l love {xiaideshiwu[1]}")